chore(ui): private button classes and ad-hoc InkWell buttons still in lib/features #1445

Problem

After the button migration no shadcn button call is left, but the review found:

• 7 private button classes: _ActionButton (Mongo collections / databases), _SmallActionButton, _TreeIconButton (20 px target), _ToolbarButton, TableEditModeButton, ThemePickerButton trigger;
• 14 material.IconButton (password eye in 5 connection forms, the search clear button, the title bar) and about 84 InkWells used as buttons;
• 6 tooltips with a literal waitDuration and about 230 literal BorderRadius.circular(n).

Scope

Replace each with QueryaButton / QueryaButton.icon / QueryaMenuButton, then land the guards of #1339 with an empty allow-list. One password-field widget for the five eyes.

Found while driving a Linux debug build of dev after the button migration (UI consistency review). Part of epic #1331.